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Security report for ycombinator.com

Y Combinator · Technology · United States

Medium risk. 7 critical or high findings in Security headers, GDPR compliance and 1 other check.

Security score

70/100

Risk levelMedium

Y Combinator is a premier startup accelerator and seed funding organization based in the United States, founded in 2005. It provides early-stage startups with funding, mentorship, and a robust network to accelerate growth. The website showcases a strong market position with references to successful portfolio companies such as Airbnb, Stripe, and OpenAI, highlighting its influence in the technology startup ecosystem. The target audience includes startup founders, investors, and technology entrepreneurs seeking funding and support. The business model revolves around investing in and accelerating startups through a structured program conducted multiple times a year.

Scanned

NIS2 and GDPR posture

NIS2 posture
17/ 100 · Critical
GDPR posture
53/ 100 · Medium
Checks completed
7of 7

Indicative only: based on publicly visible signals, not a certification or legal assessment. NIS2 signals relate to Article 21 of Directive (EU) 2022/2555; GDPR signals to Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive.

Priority findings

7 findings rated critical or high. Fix these first.

  1. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  2. GDPR compliance

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

  3. NIS2 compliance

    NIS2 expects organisations in scope to show basic security hygiene. These public signals are what an auditor or customer sees first.

    • High

      No information security framework found

      NIS2 requires documented cybersecurity and information security measures

      What to do: Implement and document information security policies and procedures

      • NIS2 21(2)(a)
      • IR 2024/2690 1.1: Implementing Regulation (EU) 2024/2690, Annex point 1.1: Policy on the security of network and information systems
      • NIST PL-1: NIST SP 800-53 Rev. 5 PL-1: Policy and Procedures
    • High

      No security policy documentation found

      NIS2 requires documented cybersecurity governance and risk management

      What to do: Create and publish cybersecurity policy and framework documentation

      • NIS2 21(2)(a)
      • IR 2024/2690 1.1: Implementing Regulation (EU) 2024/2690, Annex point 1.1: Policy on the security of network and information systems
      • NIST PL-1: NIST SP 800-53 Rev. 5 PL-1: Policy and Procedures

Need hands-on remediation? Email guard@offseq.com

Keep watching ycombinator.com

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  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Risk score drift

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Results by check

Each check with its score, findings and the evidence it collected.

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Y Combinator maintains a competitive advantage through its extensive network of partners, alumni, and a proven track record of successful exits and IPOs. Its business model is based on equity investment and providing value-added services such as mentorship and community building. The company targets early-stage startups globally, with a focus on technology-driven innovation. The website content and structure reflect a mature organization with clear branding, professional content, and comprehensive resources for founders and investors. Partnerships with related domains like Startup School and Work at a Startup enhance its ecosystem and service offerings.

Security posture

The website demonstrates a strong security posture with enforced HTTPS, modern security headers including Content Security Policy, and CSRF protection on forms. No exposed sensitive data or vulnerable libraries were detected in the provided content. However, there is no explicit public security policy or incident response contact information, which could be improved to enhance transparency and readiness. Privacy and cookie policies are present and indicate GDPR compliance, supporting data protection best practices. The use of reputable analytics and tracking tools is balanced with privacy considerations.

Recommendations

  1. Publish a dedicated security policy and incident response contact information to improve transparency and trust.
  2. Implement and publish a security.txt file to facilitate responsible vulnerability disclosure.
  3. Regularly audit third-party scripts and dependencies to mitigate potential vulnerabilities.
  4. Enhance contact information availability for business and security inquiries to improve user trust.
  5. Continue to monitor and update privacy and cookie policies to maintain compliance with evolving regulations.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Y Combinator
Description
Y Combinator created a new model for funding early stage startups. Four times a year they invest in a large number of startups.
Key services
Seed funding, Startup accelerator program, Founder support and networking, Educational resources and events
Content quality
excellent
Branding
consistent

Technology

Stack
React, Rails, Google Analytics, PostHog, Algolia, Google Fonts, Google Maps API
Frameworks
Ruby on Rails, React
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • CSRF tokens present
  • Use of Content Security Policy
  • No exposed sensitive data in HTML
  • Secure forms with CSRF protection

Analytics and tracking

Services
Google Analytics, PostHog
Tracking level
moderate
Privacy compliance
good

Advertising

Tracking pixels
PostHog
Marketing tools
PostHog, Algolia
Transparency
good

Site quality

Design
excellent
User experience
excellent
Content relevance
excellent
Navigation
excellent
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is professionally designed and well maintained.
  2. Strong brand presence with consistent logos and messaging.
  3. Comprehensive information about partners, companies, and founders.
  4. Use of modern web technologies and analytics tools.
  5. No signs of phishing, malware, or suspicious content.
  6. No explicit contact emails or phone numbers publicly listed.
  7. Privacy and cookie policies are present and appear compliant.
  8. No explicit security or incident response contact information found.
Technical notes

Notes

The website is built using a modern technology stack including Ruby on Rails and React, with integrations of Google Analytics, PostHog, and Algolia for analytics and search functionality. The site is well optimized for performance and mobile responsiveness, with good SEO and accessibility practices observed. Hosting details are not explicitly disclosed but appear to be stable and performant. The site uses Google Fonts and Google Maps API, indicating reliance on trusted third-party services. The technical implementation supports a high-quality user experience with fast loading times and clear navigation.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures.

Retrieved 2026-10-24

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